Gas-analyzer for furnaces.



G. 0. MAILLOUX & H. J. WESTQVER.

- GAS ANALYZER FOB FURNACES.

APPLIOAT IOH FILED APR. 12, 1907.

Patented Dec. 7, 1909. z snnnTg -snnm 1.

@51 MUM H811] Ga '0, MAILLOUX'8; H. JQWESTOYER.

(M8 ANALYZER FOB FURNACES.

APPLI ATIOB rn-zn AY.22,1907.

Patented. Dec. 7, 1909.

2 SHEETS-SHEET 2.

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vwe 1 l tow entrain CYPRIEN 0. MAILLOUX AND HENRY J. 'WESTOVER, OF NEW N. Y.

GAS-ANALYZER- FOE FURNACES.

Specification of Letters-Patent.

Patented Klee. Tl,

Original application filed February 7, 190?, Serial No. 356,138. Divided and this application filed April 22,

T 0 all whom it may concern:

Be it known that we, GYPRIEN 0. MAIL- LOUX and HENRY J. \Vns'rovun, citizens of the United States, residing in the city, county, and State of New York, have invented a'eertain new and useful Improvement in Gas-Analyzers for l urnaces, of which the following is a specification.

Our present invention relates to certain improvements for use in connection with apparatus for indicating the proportion of carbon dioxid in furnace gases and is equally applicable in connection with apparatus for automatically regulating the supply of air for furnaces in accordance with variations in the proportion of carbon dioxid in the gases produced therein.

This is a division of our prior application for Letters Patent, Serial. Number 356,188, lilcd February 7th, lS)0T wherein the app ratus herein shown is specifically claimed in combination with certain devices for automatic regulation of air for furnaces.

()nc principal object oil our present invcntion is the provision of means whereby a single carbon dioxld analyzer may be brought into operative relations with a number of furnaces and correspoiuling indicators.

Ai'iother object of this invention. is the provision of means whereby a carbon dioxid analyzer which draws the gas to be analyzed from a distant furnace may be supplied at all times with' furnace gas freshly brought from the furnace and therefore representative at all times of actual furnace conditions.

Our invention is illustrated in a certain preferred Ull'llJUtllll'lQlll; in the accompanying drawings wherein Figure vice Fig. 2 is a vertical section of a com bined gas director and commutator, Fig. 3 is a. top view of the operative circuit closer at the master instrument and of one of the relays which may be used therewith, Fig. l is a dcvelopi'nent of the surface of the commutator, showing in diagram one way in which a number of relays may be operated in rotation and Fig. 5 shows one form of pipe clearin means in section.

it is to be understood that our present invention is independent of the particular form or construction of automatic apparatus For analysis oi gas whereby the operative circuit. is closed, as many forms of such dc-' vices are already well known, any oncol 1. is an elevation of the entire dc-.

Serial No. 369,469.

which might be adapted to use with this-improveinent without departing from our invention. The form of analyzer shown. in Fig. l of the accompanying drawings is merely illustrative and is not to be understood as at all essential.

The particular analyzer shown in Fig. 1 is that known on the market as the Sarco analyzer and will require only very brief de- SCl'lplIlOll here. Within the cylindrical chamber 1 there is a float which falls when connected to the draft in the furnace chimney by the automatic valve 2, and rises again when the same valve connects it with atmosphere. The cord 3 is attz ched to said float and, passing over the pulley 4;. carries at its end the reservoir A. weighted tilting lever t3, pivoted at 7, is pushed. back and forth alternately by the pins 8 and 9, and its shorter arm acting on the fork 10 is thus made to operate the slide valve 2, in such a manner as to cause the l'loat within the chamber 1 to move up and down, causing reciprocating rotary nm-vement of the wheel i and vertical movcmci'it of the reservoir The reservoir 5. containing displacing liquid and being connected to the pumping chamber 11, by the flexible tube 12, admits a sample of "furnace gas through the inlet pipe 13 and then. forces this measured sample over through the tube ll to the absorption chamber 15, containing a solution of lye. The displacement of absorbing liquid thus caused depends upon the amount of residual gas after absorption of carbon dioxid, and this displacement is measured for each operation of the analyzer by the extent to which the lloat 1c is lifted in the chamber 17. The movements of this lloat are transn'iittcd by the balanced lever 18 and pivoted rod 15) to the stylus 20, whereby a vertical line is drawn upon the cylindrical chartsurtacc 21 which is slowly rotated by any appropriate means. in Figs. 1, and t is shown one form of device whereby exterior electric circuits may be selectively controlled by this form of analyzer. A variety of devices are well known in this art for utilizing such circuits for indicating puiposcs and description oi" such devices will be unnecessary here. The pivoted rod 19 is embraced loosely by the rear extension .22 ot a circuit closing bridge 2 ot magnetic material supported normally on the stylus 20. As the stylus moves up and down, this bridge moves likcwise opposite a pair of conducting rails 24,

25, oneof which is interrupted at 26 as shown in Fig. 4. Behind the rails 24, 25, we place an elcctro-magnet 27 with an extended pole piece 28, so placed that, when this magnet is energized, the bridge 23 is attracted against the ra s 24, 25. As heretofore explained, the maximum height. to which the stylus and bridge are carried by movement of the float l6 depends upon the volume of residual gases in the absorption chamber 15 and therefore on the proportion of carbon dioxid which is in each sample of furnace gas. The point of interruption 26 is therefore so placed that it will be opposite that position of the bridge 23 which corresponds to the ideal proportion. of carbon dioXid. If the carbon dioxid is in 0X cess the maximum height of the bridge 23 will occuiubelow 26 and, if the magnet 27 is then energized, the bridge will, be drawn into contact with the lower section of the rail 25, connecting it electrically with the rail 24. If the carbon dioxid is deficient connection will be caused between 24 and the upper section of25. W e therefore provide means for energizin the magnet 27 at the moment when the bri go 23 is at its maximum height and for this purpose We prefer the devices shown .in Fig. 1. Here one terminal of-27 is connected to one pole of the battery 29, Whose opposite pole is connected to the spring terminal 30 on the lever 6. The second terminal of 27 is connected to the pin 9. Thus, at the moment that pin 9 operates valve 2 so as to lower the reservoir 5 (which occurs at the end of each operation and with the float 16 fully raised) the circuit of 27 is closed at 30.

One simple form of indicator 'operable by the means thus far described is shown as an illustrative example in Fig. 3. Here a polarized relay 31, provided with oppositely Wound coils 32, 33, connected respectively to the two sections of the interrupted rail 25 acts on the pointer-armature 34, Whose position at the end of each analysis therefor indicates whether the carbon dioxid is in excess or not. If the pointer 34 hangs vertically after any given analysis it indicates the existence of the proper desired proportion of carbon dioxid in the furnace.

One branch of our present invention relates to means whereby, just after each operation of the analyzer, the entire apparatus may be brought into relation with a new furnace and its corresponding indicator. For this purpose a separate gas conveying pipe 35 brings gas from eaclrfurnace to a gas-directing apparatus comprising a stationary support 36 and. a rotary valve 37 containing a gas-directing passage 38. One end of the passage 38 registers successively with the dill'ercnt pipes as the valve body 37 is rotated, while the opposite end of the passage 38 registers permanently with the inlet pipe 18. Rotation of 37 is preferably .At the For this purpose" the cylindrical surtact with the strip 43, while separate brushes 8o 47', are placed symmetrically around the body 37 so as to make contact successively with the tongue 44. Each brush 47 is permanently connected to both indicator coils 32, 33, as shown in Fig. 4, and the opposite ends of these coils are respectively connected to the through wires 48, 49, connected respectively to the two sections of the rail 25. From this it Will be seen that, as the magnet- 39 is energized after each operation of the analyzer, a new furnace tube 35 and a new indicator will be automatically placed in operative relation to the master instrument after each analysis.

Another branch of our improvement has at relation to means whereby the sample of gas drawn in for each analysis shall represent always the latestcondition of the furnace to be tested. Whe're the master instrument is located at some distance from the 106 furnaces, the pipes conveying gas samples are necessarily long, and unless means were supplied to correct the error, each analys1s would show only the conditions existing 111 that part of the conveying tube near the instrument which might often diii'er materially from those actually existing in the" furnace. To obviate this difliculty, we prefer the means shown in Figs. 1 and 5 wherein a rotary valve 48 is operated momentarily after each analysis by means of the solenoid 50 .in series with39 and 27, which solenoid acts by core 51 and lever 52 to rotate the valve in one direction. The spring 53 acts to return said valve. pipe 54 to the valve 48 and, when the solenoid 50 is energized (see Fig. 5.) this steam passes by pipe 55 to the inspirator 56, discharging at-57. In this pos tion of the rotary valve 48, the passage 58, which is in permanent communication with the inlet pipe 13 on the side toward the furnace, admits gas through said pipe to the mspirator and the steam issuing at 57 draws with it the gas in the pipe 13 and whichever of the 125 pipes 35 is at the time in communication with it. The entire line of pipe to the furnace is thus cleared out and, at the conclusion of'the operation, the gas which is left near the analyzer is a specimen properly Steam is led by the the analyzer.

energizing the inspirator, and bringing the passage 58' into communication withthe opening 59 (see dotted circle in Fig. 5) which opening leads directly to the inlet pipe 13 next to The valve is thus in condition to permit the next Operation of the analyzer to draw in a specimen of gas from one of the conveying pipes, 35. r

It should be explained here that the gas directing means and conveying pipes are (liagraunnat-ically shown in Fig. 1 for the sake of convenience, and that the correct relation of sizes is shown in Fig. 2.

A variety-of changes can be made in this apparatus without departing from our invention and we are not to be limited to the details herein shown and described.

What we claim is:

1. In combination, an automatic gas analysis apparatus, a plurality of pipes for delivering the gaseous products of combustion from a plurality'ot' furnaces, a directing valve by which each of said pipes, one after another communicates with said gas analysis apparatus, and means for operating said valve controlled by the movement of the said gas analysis apparatus, substantially as described.

An automatic CO analyzer, a plurality of gas conveying pipes, at directing valve with which said pipes communicate for placing them one after the other in operative relation with said analyzer, electro-magnetic means for moving said valve and a circuit controlled by movement of said analyzer for said valve-moving means, substantially as described. p

3. In combination, an automatic gas analyzing apparatus, a. gas-directing means having entrance pipes arranged. around a common center, a 'revoluble directing pipe placed so as to register at one end with said entrance pipes successively, 'and electro-mag netic means controlledby said analyzer i'er turning said directing pipe step-by-step, substzmtiallyas described.

41-. i' rdevicc of the class-described comm-ising an analyzer, a gas-conveying pipe therefor, cloning means for said pipe, an actuating device for said clearing means and automatic means controlled by said analyzer for causing operation of said. actuating device,

substantially as described.

5. A. device of the class described comprising an analyzer, a gas-conveying pipe therefor, a gas-directing device inserted in the course of said pipe, clearing means for said pipe, an actuating device for said clearing means andautomatic means controlled by said analyzer for causing substantially simultaneous operation of said gas-directing device and of said actuating device, substantially as described 6. A device of the class described comprising an analyzer, a gas-conveying pipe therefor, a clearing means for said pipe, an electromagnetic actuating device for said means and a circuit closer operated by said analyzer for energizin said actuating device, substantially as described.

7. A device of the class described comprising an analyzer, a gas-conveying pipe therefor, a clearing means for said pipe, an electro-magnetic actuating devioe for said means, an exit for the analyzzij an electric circuit for said actuating devi e and means for both operating said exit valve and closing said circuit, substantially as described.

8. In combination, a gas analysis apparatus, a plurality of pipes for delivering the gaseous products of combustion from a plurality offurnaces ia device for bringing each of said pipes, one after another into communication with said gas analysis apparatus, and operating means. for'said' device automatically actuated by said gas analysis I apparatus, substantially as described.

, indicators, a device for bringing said pipes and said indicators one after the other into operative.relations with said gas analysis apparatus whereby the composltion of the gas from each furnace is indicated on its corresponding indicator, said device being automatically actuated by said gas analysis apparatus, substantially as described.

CYPRIEN O. MAILLOIIX. A HENRY J; W IGS'IOVER.

Witnesses A'Uoirs'r L. M/urrm,

llnuuius It. KNoX. 

